A 59-year-old Man with Fa...

A 59-year-old man presents with a 1-week history of progressive facial swelling, swelling of both arms and shortness of breath on climbing a flight of stairs. He has smoked 20 cigarettes per day for 40 years and works at a garage. His chest radiograph that shows a widened mediastinum and a right hilar mass. He had a previous chest radiograph 6 months earlier, which was normal apart from some patchy shadowing in the left midzone, which is no longer present. What is its diagnosis and it's management?